Her mother, De­bra, said wi-fi ‘killed her daugh­ter’ as she was driven to de­spair by the con­di­tion’s symp­toms. She had a ‘heated ex­change’ with Jenny’s teach­ers about use of wi-fi in school but they ‘wouldn’t lis­ten’, the in­quest was told.

When staff pun­ished Jenny for leav­ing class­rooms con­tain­ing wire­less routers, they made her ‘take de­ten­tions in rooms that were mak­ing her ill’, her mother said.

Jenny’s body was found hang­ing near her home in Chadling­ton, Ox­ford­shire, on June 11. Coro­ner Dar­ren Sal­ter de­liv­ered a nar­ra­tive ver­dict af­ter rul­ing it was pos­si­ble the Chip­ping Nor­ton School pupil had not in­tended to kill her­self and was mak­ing a cry for help.

No med­i­cal notes were pre­sented about Jenny’s con­di­tion, which is not recog­nised by UK health bod- ies de­spite a grow­ing num­ber com­plain­ing they are af­fected. Jenny started show­ing signs of EMS in Novem­ber 2012 when wi-fi was in­stalled in their home.

‘Jenny was get­ting ill and so was I. I did some re­search and found out how dan­ger­ous wi-fi could be so I had it taken out of the house,’ Miss Fry told Ox­ford­shire Coroners’ Court. ‘Both Jenny and I were fine at home but Jenny con­tin­ued to be ill at school in cer­tain ar­eas.

‘She was re­ceiv­ing lots of de­ten- tions – not for be­ing dis­rup­tive in class or mis­be­hav­ing but of­ten be­cause she used to take her­self out of the class­room to find another where she was able to work.

‘I took lots of in­for­ma­tion into school to show the head teacher, Si­mon Duffy, but he said there was equally the same in­for­ma­tion avail­able claim­ing wi-fi was safe.’

Af­ter the hear­ing, den­tal nurse Miss Fry, 55, said her daugh­ter had left let­ters say­ing she could not cope with her al­lergy any more.

Miss Fry and part­ner Charles New­man, 60, a pi­lot with whom she has two other chil­dren, are cam­paign­ing for wi-fi to be re­moved from schools, and urg­ing the Govern­ment to re­search EHS.

Mr Duffy said school gov­er­nors were ‘con­tent that the in­stalled equip­ment com­plies with the rel­e­vant reg­u­la­tions and will en­sure this con­tin­ues to be the case’.